Remove IPC_BEGIN_MESSAGE_MAP_EX macro since r270839 made all bad IPCs kill their child processes.

content/browser/renderer_host/media/midi_host.h

 // Copyright (c) 2013 The Chromium Authors. All rights reserved.
 // Use of this source code is governed by a BSD-style license that can be
 // found in the LICENSE file.
 
 #ifndef CONTENT_BROWSER_RENDERER_HOST_MEDIA_MIDI_HOST_H_
 #define CONTENT_BROWSER_RENDERER_HOST_MEDIA_MIDI_HOST_H_
 
 #include <vector>
 
 #include "base/gtest_prod_util.h"
@@ skipping 14 matching lines @@
 
 class CONTENT_EXPORT MidiHost
     : public BrowserMessageFilter,
       public media::MidiManagerClient {
  public:
   // Called from UI thread from the owner of this object.
   MidiHost(int renderer_process_id, media::MidiManager* midi_manager);
 
   // BrowserMessageFilter implementation.
   virtual void OnDestruct() const OVERRIDE;
-  virtual bool OnMessageReceived(const IPC::Message& message,
-                                 bool* message_was_ok) OVERRIDE;
+  virtual bool OnMessageReceived(const IPC::Message& message) OVERRIDE;
 
   // MidiManagerClient implementation.
   virtual void CompleteStartSession(int client_id,
                                     media::MidiResult result) OVERRIDE;
   virtual void ReceiveMidiData(uint32 port,
                                const uint8* data,
                                size_t length,
                                double timestamp) OVERRIDE;
   virtual void AccumulateMidiBytesSent(size_t n) OVERRIDE;
 
@@ skipping 45 matching lines @@
 
   // Protects access to |sent_bytes_in_flight_|.
   base::Lock in_flight_lock_;
 
   DISALLOW_COPY_AND_ASSIGN(MidiHost);
 };
 
 }  // namespace content
 
 #endif  // CONTENT_BROWSER_RENDERER_HOST_MEDIA_MIDI_HOST_H_